Operating instructions

Interfaces, Displays and Operator Controls
Industrial Ethernet OSM/ESM
C79000-Z8976-C068-04
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4.1.4 FO Ports
The FO ports have BFOC/2.5(ST) female connectors. They monitor the connected
cable for wire breaks complying with the IEEE 802.3 100 Base-FX standard. A break
on the FO cable is always signaled by the port status display of both connected OSMs.
(Status LED of the port goes off).